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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ObjIdMap.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.AbstractMap;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.AbstractSet;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.ConcurrentModificationException;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Iterator;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.Map;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.NoSuchElementException;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.Set;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.core.ObjId;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>/**<a name="line.20"></a>
<span class="sourceLineNo">021</span> * A map with {@link ObjId} keys.<a name="line.21"></a>
<span class="sourceLineNo">022</span> *<a name="line.22"></a>
<span class="sourceLineNo">023</span> * &lt;p&gt;<a name="line.23"></a>
<span class="sourceLineNo">024</span> * This implementation is space optimized for the 64-bits of information contained in an {@link ObjId}.<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Instances do not accept null keys and are not thread safe.<a name="line.25"></a>
<span class="sourceLineNo">026</span> * &lt;/p&gt;<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span>public class ObjIdMap&lt;V&gt; extends AbstractMap&lt;ObjId, V&gt; implements Cloneable {<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    // Algorithm described here: http://en.wikipedia.org/wiki/Open_addressing<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    private static final float EXPAND_THRESHOLD = 0.70f;    // expand array when &gt; 70% full<a name="line.32"></a>
<span class="sourceLineNo">033</span>    private static final float SHRINK_THRESHOLD = 0.25f;    // shrink array when &lt; 25% full<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    private static final int MIN_LOG2_LENGTH = 4;           // minimum array length = 16 slots<a name="line.35"></a>
<span class="sourceLineNo">036</span>    private static final int MAX_LOG2_LENGTH = 30;          // maximum array length = 1 billion slots<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    private long[] keys;                                    // has length always a power of 2<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private V[] values;                                     // will be null if we are being used to implement ObjIdSet<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private int size;                                       // the number of entries in the map<a name="line.40"></a>
<span class="sourceLineNo">041</span>    private int log2len;                                    // log2 of keys.length and values.length (if not null)<a name="line.41"></a>
<span class="sourceLineNo">042</span>    private int upperSizeLimit;                             // size threshold when to grow array<a name="line.42"></a>
<span class="sourceLineNo">043</span>    private int lowerSizeLimit;                             // size threshold when to shrink array<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private int numHashShifts;                              // used by hash() function<a name="line.44"></a>
<span class="sourceLineNo">045</span>    private volatile int modcount;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>// Constructors<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * Constructs an empty instance.<a name="line.50"></a>
<span class="sourceLineNo">051</span>     */<a name="line.51"></a>
<span class="sourceLineNo">052</span>    public ObjIdMap() {<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this(0, true);<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * Constructs an instance with the given initial capacity.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @param capacity initial capacity<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @throws IllegalArgumentException if {@code capacity} is negative<a name="line.60"></a>
<span class="sourceLineNo">061</span>     */<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public ObjIdMap(int capacity) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        this(capacity, true);<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * Constructs an instance initialized from the given map.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     *<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @param map initial contents for this instance<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @throws NullPointerException if {@code map} is null<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @throws IllegalArgumentException if {@code map} contains a null key<a name="line.71"></a>
<span class="sourceLineNo">072</span>     */<a name="line.72"></a>
<span class="sourceLineNo">073</span>    public ObjIdMap(Map&lt;ObjId, ? extends V&gt; map) {<a name="line.73"></a>
<span class="sourceLineNo">074</span>        this(map.size(), true);<a name="line.74"></a>
<span class="sourceLineNo">075</span>        for (Map.Entry&lt;ObjId, ? extends V&gt; entry : map.entrySet())<a name="line.75"></a>
<span class="sourceLineNo">076</span>            this.put(entry.getKey(), entry.getValue());<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    // Internal constructor<a name="line.79"></a>
<span class="sourceLineNo">080</span>    ObjIdMap(int capacity, boolean withValues) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>        if (capacity &lt; 0)<a name="line.81"></a>
<span class="sourceLineNo">082</span>            throw new IllegalArgumentException("capacity &lt; 0");<a name="line.82"></a>
<span class="sourceLineNo">083</span>        capacity &amp;= 0x3fffffff;                                                 // avoid integer overflow from large values<a name="line.83"></a>
<span class="sourceLineNo">084</span>        capacity = (int)(capacity / EXPAND_THRESHOLD);                          // increase to account for overhead<a name="line.84"></a>
<span class="sourceLineNo">085</span>        capacity = Math.max(1, capacity);                                       // avoid zero, on which the next line fails<a name="line.85"></a>
<span class="sourceLineNo">086</span>        this.log2len = 32 - Integer.numberOfLeadingZeros(capacity - 1);         // round up to next power of 2<a name="line.86"></a>
<span class="sourceLineNo">087</span>        this.log2len = Math.max(MIN_LOG2_LENGTH, this.log2len);                 // clip to bounds<a name="line.87"></a>
<span class="sourceLineNo">088</span>        this.log2len = Math.min(MAX_LOG2_LENGTH, this.log2len);<a name="line.88"></a>
<span class="sourceLineNo">089</span>        this.createArrays(withValues);<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>// Methods<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>    @Override<a name="line.94"></a>
<span class="sourceLineNo">095</span>    public int size() {<a name="line.95"></a>
<span class="sourceLineNo">096</span>        return this.size;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>    @Override<a name="line.99"></a>
<span class="sourceLineNo">100</span>    public boolean isEmpty() {<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return this.size == 0;<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>    public boolean containsKey(Object obj) {<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>        // Check type<a name="line.107"></a>
<span class="sourceLineNo">108</span>        if (!(obj instanceof ObjId))<a name="line.108"></a>
<span class="sourceLineNo">109</span>            return false;<a name="line.109"></a>
<span class="sourceLineNo">110</span>        final long value = ((ObjId)obj).asLong();<a name="line.110"></a>
<span class="sourceLineNo">111</span>        assert value != 0;<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>        // Check slot for value<a name="line.113"></a>
<span class="sourceLineNo">114</span>        final int slot = this.findSlot(value);<a name="line.114"></a>
<span class="sourceLineNo">115</span>        if (this.keys[slot] == value)<a name="line.115"></a>
<span class="sourceLineNo">116</span>            return true;<a name="line.116"></a>
<span class="sourceLineNo">117</span>        assert this.keys[slot] == 0;<a name="line.117"></a>
<span class="sourceLineNo">118</span>        return false;<a name="line.118"></a>
<span class="sourceLineNo">119</span>    }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>    @Override<a name="line.121"></a>
<span class="sourceLineNo">122</span>    public V get(Object obj) {<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>        // Check type<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (!(obj instanceof ObjId))<a name="line.125"></a>
<span class="sourceLineNo">126</span>            return null;<a name="line.126"></a>
<span class="sourceLineNo">127</span>        final long value = ((ObjId)obj).asLong();<a name="line.127"></a>
<span class="sourceLineNo">128</span>        assert value != 0;<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>        // Check slot for value<a name="line.130"></a>
<span class="sourceLineNo">131</span>        final int slot = this.findSlot(value);<a name="line.131"></a>
<span class="sourceLineNo">132</span>        if (this.keys[slot] == value)<a name="line.132"></a>
<span class="sourceLineNo">133</span>            return this.values != null ? this.values[slot] : null;<a name="line.133"></a>
<span class="sourceLineNo">134</span>        assert this.keys[slot] == 0;<a name="line.134"></a>
<span class="sourceLineNo">135</span>        return null;<a name="line.135"></a>
<span class="sourceLineNo">136</span>    }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>    @Override<a name="line.138"></a>
<span class="sourceLineNo">139</span>    public V put(ObjId id, V value) {<a name="line.139"></a>
<span class="sourceLineNo">140</span>        if (id == null)<a name="line.140"></a>
<span class="sourceLineNo">141</span>            throw new IllegalArgumentException("illegal null key");<a name="line.141"></a>
<span class="sourceLineNo">142</span>        final long key = id.asLong();<a name="line.142"></a>
<span class="sourceLineNo">143</span>        assert key != 0;<a name="line.143"></a>
<span class="sourceLineNo">144</span>        return this.insert(key, value);<a name="line.144"></a>
<span class="sourceLineNo">145</span>    }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span>    @Override<a name="line.147"></a>
<span class="sourceLineNo">148</span>    public V remove(Object obj) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>        if (!(obj instanceof ObjId))<a name="line.149"></a>
<span class="sourceLineNo">150</span>            return null;<a name="line.150"></a>
<span class="sourceLineNo">151</span>        final long key = ((ObjId)obj).asLong();<a name="line.151"></a>
<span class="sourceLineNo">152</span>        assert key != 0;<a name="line.152"></a>
<span class="sourceLineNo">153</span>        return this.exsert(key);<a name="line.153"></a>
<span class="sourceLineNo">154</span>    }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>    @Override<a name="line.156"></a>
<span class="sourceLineNo">157</span>    public void clear() {<a name="line.157"></a>
<span class="sourceLineNo">158</span>        this.log2len = MIN_LOG2_LENGTH;<a name="line.158"></a>
<span class="sourceLineNo">159</span>        this.createArrays(this.values != null);<a name="line.159"></a>
<span class="sourceLineNo">160</span>        this.size = 0;<a name="line.160"></a>
<span class="sourceLineNo">161</span>        this.modcount++;<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    @Override<a name="line.164"></a>
<span class="sourceLineNo">165</span>    public ObjIdSet keySet() {<a name="line.165"></a>
<span class="sourceLineNo">166</span>        return new ObjIdSet(this);<a name="line.166"></a>
<span class="sourceLineNo">167</span>    }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span>    @Override<a name="line.169"></a>
<span class="sourceLineNo">170</span>    public Set&lt;Map.Entry&lt;ObjId, V&gt;&gt; entrySet() {<a name="line.170"></a>
<span class="sourceLineNo">171</span>        return new EntrySet();<a name="line.171"></a>
<span class="sourceLineNo">172</span>    }<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span>    /**<a name="line.174"></a>
<span class="sourceLineNo">175</span>     * Produce a debug dump of this instance's keys.<a name="line.175"></a>
<span class="sourceLineNo">176</span>     */<a name="line.176"></a>
<span class="sourceLineNo">177</span>    String debugDump() {<a name="line.177"></a>
<span class="sourceLineNo">178</span>        final StringBuilder buf = new StringBuilder();<a name="line.178"></a>
<span class="sourceLineNo">179</span>        buf.append("OBJIDMAP: size=" + this.size + " len=" + this.keys.length + " modcount=" + this.modcount);<a name="line.179"></a>
<span class="sourceLineNo">180</span>        for (int i = 0; i &lt; this.keys.length; i++)<a name="line.180"></a>
<span class="sourceLineNo">181</span>            buf.append('\n').append(String.format(" [%2d] %016x (hash %d)", i, this.keys[i], this.hash(this.keys[i])));<a name="line.181"></a>
<span class="sourceLineNo">182</span>        return buf.toString();<a name="line.182"></a>
<span class="sourceLineNo">183</span>    }<a name="line.183"></a>
<span class="sourceLineNo">184</span><a name="line.184"></a>
<span class="sourceLineNo">185</span>// Object<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>    @Override<a name="line.187"></a>
<span class="sourceLineNo">188</span>    public int hashCode() {<a name="line.188"></a>
<span class="sourceLineNo">189</span>        return this.entrySet().hashCode();              // this is more efficient than what superclass does<a name="line.189"></a>
<span class="sourceLineNo">190</span>    }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>// Cloneable<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>    @Override<a name="line.194"></a>
<span class="sourceLineNo">195</span>    @SuppressWarnings("unchecked")<a name="line.195"></a>
<span class="sourceLineNo">196</span>    public ObjIdMap&lt;V&gt; clone() {<a name="line.196"></a>
<span class="sourceLineNo">197</span>        final ObjIdMap&lt;V&gt; clone;<a name="line.197"></a>
<span class="sourceLineNo">198</span>        try {<a name="line.198"></a>
<span class="sourceLineNo">199</span>            clone = (ObjIdMap&lt;V&gt;)super.clone();<a name="line.199"></a>
<span class="sourceLineNo">200</span>        } catch (CloneNotSupportedException e) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>            throw new RuntimeException(e);<a name="line.201"></a>
<span class="sourceLineNo">202</span>        }<a name="line.202"></a>
<span class="sourceLineNo">203</span>        clone.keys = clone.keys.clone();<a name="line.203"></a>
<span class="sourceLineNo">204</span>        if (clone.values != null)<a name="line.204"></a>
<span class="sourceLineNo">205</span>            clone.values = clone.values.clone();<a name="line.205"></a>
<span class="sourceLineNo">206</span>        return clone;<a name="line.206"></a>
<span class="sourceLineNo">207</span>    }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>// Package methods<a name="line.209"></a>
<span class="sourceLineNo">210</span><a name="line.210"></a>
<span class="sourceLineNo">211</span>    long[] getKeys() {<a name="line.211"></a>
<span class="sourceLineNo">212</span>        return this.keys;<a name="line.212"></a>
<span class="sourceLineNo">213</span>    }<a name="line.213"></a>
<span class="sourceLineNo">214</span><a name="line.214"></a>
<span class="sourceLineNo">215</span>    V getValue(int slot) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>        return this.values[slot];<a name="line.216"></a>
<span class="sourceLineNo">217</span>    }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>    void setValue(int slot, V value) {<a name="line.219"></a>
<span class="sourceLineNo">220</span>        this.values[slot] = value;<a name="line.220"></a>
<span class="sourceLineNo">221</span>    }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>// Internal methods<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>    private V insert(long key, V value) {<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span>        // Find slot for key<a name="line.227"></a>
<span class="sourceLineNo">228</span>        assert key != 0;<a name="line.228"></a>
<span class="sourceLineNo">229</span>        final int slot = this.findSlot(key);<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span>        // Key already exists? Just replace value<a name="line.231"></a>
<span class="sourceLineNo">232</span>        if (this.keys[slot] == key) {<a name="line.232"></a>
<span class="sourceLineNo">233</span>            if (this.values == null)<a name="line.233"></a>
<span class="sourceLineNo">234</span>                return null;<a name="line.234"></a>
<span class="sourceLineNo">235</span>            final V prev = this.values[slot];<a name="line.235"></a>
<span class="sourceLineNo">236</span>            this.values[slot] = value;<a name="line.236"></a>
<span class="sourceLineNo">237</span>            return prev;<a name="line.237"></a>
<span class="sourceLineNo">238</span>        }<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>        // Insert new key/value pair<a name="line.240"></a>
<span class="sourceLineNo">241</span>        assert this.keys[slot] == 0;<a name="line.241"></a>
<span class="sourceLineNo">242</span>        this.keys[slot] = key;<a name="line.242"></a>
<span class="sourceLineNo">243</span>        if (this.values != null) {<a name="line.243"></a>
<span class="sourceLineNo">244</span>            assert this.values[slot] == null;<a name="line.244"></a>
<span class="sourceLineNo">245</span>            this.values[slot] = value;<a name="line.245"></a>
<span class="sourceLineNo">246</span>        }<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span>        // Expand if necessary<a name="line.248"></a>
<span class="sourceLineNo">249</span>        if (++this.size &gt; this.upperSizeLimit &amp;&amp; this.log2len &lt; MAX_LOG2_LENGTH) {<a name="line.249"></a>
<span class="sourceLineNo">250</span>            this.log2len++;<a name="line.250"></a>
<span class="sourceLineNo">251</span>            this.resize();<a name="line.251"></a>
<span class="sourceLineNo">252</span>        }<a name="line.252"></a>
<span class="sourceLineNo">253</span>        this.modcount++;<a name="line.253"></a>
<span class="sourceLineNo">254</span>        return null;<a name="line.254"></a>
<span class="sourceLineNo">255</span>    }<a name="line.255"></a>
<span class="sourceLineNo">256</span><a name="line.256"></a>
<span class="sourceLineNo">257</span>    private V exsert(long key) {<a name="line.257"></a>
<span class="sourceLineNo">258</span><a name="line.258"></a>
<span class="sourceLineNo">259</span>        // Find slot for key<a name="line.259"></a>
<span class="sourceLineNo">260</span>        final int slot = this.findSlot(key);<a name="line.260"></a>
<span class="sourceLineNo">261</span>        if (this.keys[slot] == 0) {<a name="line.261"></a>
<span class="sourceLineNo">262</span>            assert this.values == null || this.values[slot] == null;<a name="line.262"></a>
<span class="sourceLineNo">263</span>            return null;<a name="line.263"></a>
<span class="sourceLineNo">264</span>        }<a name="line.264"></a>
<span class="sourceLineNo">265</span>        assert this.keys[slot] == key;<a name="line.265"></a>
<span class="sourceLineNo">266</span><a name="line.266"></a>
<span class="sourceLineNo">267</span>        // Remove key<a name="line.267"></a>
<span class="sourceLineNo">268</span>        return this.exsert(slot);<a name="line.268"></a>
<span class="sourceLineNo">269</span>    }<a name="line.269"></a>
<span class="sourceLineNo">270</span><a name="line.270"></a>
<span class="sourceLineNo">271</span>    private V exsert(final int slot) {<a name="line.271"></a>
<span class="sourceLineNo">272</span><a name="line.272"></a>
<span class="sourceLineNo">273</span>        // Sanity check<a name="line.273"></a>
<span class="sourceLineNo">274</span>        assert this.keys[slot] != 0;<a name="line.274"></a>
<span class="sourceLineNo">275</span>        final V ovalue = this.values != null ? this.values[slot] : null;<a name="line.275"></a>
<span class="sourceLineNo">276</span><a name="line.276"></a>
<span class="sourceLineNo">277</span>        // Remove key/value pair and fixup subsequent entries<a name="line.277"></a>
<span class="sourceLineNo">278</span>        int i = slot;                                                   // i points to the new empty slot<a name="line.278"></a>
<span class="sourceLineNo">279</span>        int j = slot;                                                   // j points to the next slot to fixup<a name="line.279"></a>
<span class="sourceLineNo">280</span>loop:   while (true) {<a name="line.280"></a>
<span class="sourceLineNo">281</span>            this.keys[i] = 0;<a name="line.281"></a>
<span class="sourceLineNo">282</span>            if (this.values != null)<a name="line.282"></a>
<span class="sourceLineNo">283</span>                this.values[i] = null;<a name="line.283"></a>
<span class="sourceLineNo">284</span>            long jkey;<a name="line.284"></a>
<span class="sourceLineNo">285</span>            V jvalue;<a name="line.285"></a>
<span class="sourceLineNo">286</span>            while (true) {<a name="line.286"></a>
<span class="sourceLineNo">287</span>                j = (j + 1) &amp; (this.keys.length - 1);<a name="line.287"></a>
<span class="sourceLineNo">288</span>                jkey = this.keys[j];<a name="line.288"></a>
<span class="sourceLineNo">289</span>                if (jkey == 0)                                          // end of hash chain, no more fixups required<a name="line.289"></a>
<span class="sourceLineNo">290</span>                    break loop;<a name="line.290"></a>
<span class="sourceLineNo">291</span>                jvalue = this.values != null ? this.values[j] : null;   // get corresponding value<a name="line.291"></a>
<span class="sourceLineNo">292</span>                final int k = this.hash(jkey);                          // find where jkey's hash chain started<a name="line.292"></a>
<span class="sourceLineNo">293</span>                if (i &lt;= j ? (i &lt; k &amp;&amp; k &lt;= j) : (i &lt; k || k &lt;= j))     // jkey is between i and j, so it's not cut off<a name="line.293"></a>
<span class="sourceLineNo">294</span>                    continue;<a name="line.294"></a>
<span class="sourceLineNo">295</span>                break;                                                  // jkey is cut off from its hash chain, need to fix<a name="line.295"></a>
<span class="sourceLineNo">296</span>            }<a name="line.296"></a>
<span class="sourceLineNo">297</span>            this.keys[i] = jkey;                                        // move jkey back into its hash chain<a name="line.297"></a>
<span class="sourceLineNo">298</span>            if (this.values != null)<a name="line.298"></a>
<span class="sourceLineNo">299</span>                this.values[i] = jvalue;<a name="line.299"></a>
<span class="sourceLineNo">300</span>            i = j;                                                      // restart fixups at jkey's old location<a name="line.300"></a>
<span class="sourceLineNo">301</span>        }<a name="line.301"></a>
<span class="sourceLineNo">302</span><a name="line.302"></a>
<span class="sourceLineNo">303</span>        // Shrink if necessary<a name="line.303"></a>
<span class="sourceLineNo">304</span>        if (--this.size &lt; this.lowerSizeLimit &amp;&amp; this.log2len &gt; MIN_LOG2_LENGTH) {<a name="line.304"></a>
<span class="sourceLineNo">305</span>            this.log2len--;<a name="line.305"></a>
<span class="sourceLineNo">306</span>            this.resize();<a name="line.306"></a>
<span class="sourceLineNo">307</span>        }<a name="line.307"></a>
<span class="sourceLineNo">308</span>        this.modcount++;<a name="line.308"></a>
<span class="sourceLineNo">309</span>        return ovalue;<a name="line.309"></a>
<span class="sourceLineNo">310</span>    }<a name="line.310"></a>
<span class="sourceLineNo">311</span><a name="line.311"></a>
<span class="sourceLineNo">312</span>    private int findSlot(long value) {<a name="line.312"></a>
<span class="sourceLineNo">313</span>        assert value != 0;<a name="line.313"></a>
<span class="sourceLineNo">314</span>        int slot = this.hash(value);<a name="line.314"></a>
<span class="sourceLineNo">315</span>        while (true) {<a name="line.315"></a>
<span class="sourceLineNo">316</span>            final long existing = this.keys[slot];<a name="line.316"></a>
<span class="sourceLineNo">317</span>            if (existing == 0 || existing == value)<a name="line.317"></a>
<span class="sourceLineNo">318</span>                return slot;<a name="line.318"></a>
<span class="sourceLineNo">319</span>            slot = (slot + 1) &amp; (this.keys.length - 1);<a name="line.319"></a>
<span class="sourceLineNo">320</span>        }<a name="line.320"></a>
<span class="sourceLineNo">321</span>    }<a name="line.321"></a>
<span class="sourceLineNo">322</span><a name="line.322"></a>
<span class="sourceLineNo">323</span>    private int hash(long value) {<a name="line.323"></a>
<span class="sourceLineNo">324</span>        final int shift = this.log2len;<a name="line.324"></a>
<span class="sourceLineNo">325</span>        int hash = (int)value;<a name="line.325"></a>
<span class="sourceLineNo">326</span>        for (int i = 0; i &lt; this.numHashShifts; i++) {<a name="line.326"></a>
<span class="sourceLineNo">327</span>            value &gt;&gt;&gt;= shift;<a name="line.327"></a>
<span class="sourceLineNo">328</span>            hash ^= (int)value;<a name="line.328"></a>
<span class="sourceLineNo">329</span>        }<a name="line.329"></a>
<span class="sourceLineNo">330</span>        return hash &amp; (this.keys.length - 1);<a name="line.330"></a>
<span class="sourceLineNo">331</span>    }<a name="line.331"></a>
<span class="sourceLineNo">332</span><a name="line.332"></a>
<span class="sourceLineNo">333</span>    private void resize() {<a name="line.333"></a>
<span class="sourceLineNo">334</span><a name="line.334"></a>
<span class="sourceLineNo">335</span>        // Grab a copy of old arrays and create new ones<a name="line.335"></a>
<span class="sourceLineNo">336</span>        final long[] oldKeys = this.keys;<a name="line.336"></a>
<span class="sourceLineNo">337</span>        final V[] oldValues = this.values;<a name="line.337"></a>
<span class="sourceLineNo">338</span>        assert oldValues == null || oldValues.length == oldKeys.length;<a name="line.338"></a>
<span class="sourceLineNo">339</span>        this.createArrays(oldValues != null);<a name="line.339"></a>
<span class="sourceLineNo">340</span><a name="line.340"></a>
<span class="sourceLineNo">341</span>        // Rehash key/value pairs from old array into new array<a name="line.341"></a>
<span class="sourceLineNo">342</span>        for (int oldSlot = 0; oldSlot &lt; oldKeys.length; oldSlot++) {<a name="line.342"></a>
<span class="sourceLineNo">343</span>            final long key = oldKeys[oldSlot];<a name="line.343"></a>
<span class="sourceLineNo">344</span>            if (key == 0) {<a name="line.344"></a>
<span class="sourceLineNo">345</span>                assert oldValues == null || oldValues[oldSlot] == null;<a name="line.345"></a>
<span class="sourceLineNo">346</span>                continue;<a name="line.346"></a>
<span class="sourceLineNo">347</span>            }<a name="line.347"></a>
<span class="sourceLineNo">348</span>            final int newSlot = this.findSlot(key);<a name="line.348"></a>
<span class="sourceLineNo">349</span>            assert this.keys[newSlot] == 0;<a name="line.349"></a>
<span class="sourceLineNo">350</span>            this.keys[newSlot] = key;<a name="line.350"></a>
<span class="sourceLineNo">351</span>            if (this.values != null) {<a name="line.351"></a>
<span class="sourceLineNo">352</span>                assert this.values[newSlot] == null;<a name="line.352"></a>
<span class="sourceLineNo">353</span>                this.values[newSlot] = oldValues[oldSlot];<a name="line.353"></a>
<span class="sourceLineNo">354</span>            }<a name="line.354"></a>
<span class="sourceLineNo">355</span>        }<a name="line.355"></a>
<span class="sourceLineNo">356</span>    }<a name="line.356"></a>
<span class="sourceLineNo">357</span><a name="line.357"></a>
<span class="sourceLineNo">358</span>    @SuppressWarnings("unchecked")<a name="line.358"></a>
<span class="sourceLineNo">359</span>    private void createArrays(boolean withValues) {<a name="line.359"></a>
<span class="sourceLineNo">360</span>        assert this.log2len &gt;= MIN_LOG2_LENGTH;<a name="line.360"></a>
<span class="sourceLineNo">361</span>        assert this.log2len &lt;= MAX_LOG2_LENGTH;<a name="line.361"></a>
<span class="sourceLineNo">362</span>        final int arrayLength = 1 &lt;&lt; this.log2len;<a name="line.362"></a>
<span class="sourceLineNo">363</span>        this.lowerSizeLimit = this.log2len &gt; MIN_LOG2_LENGTH ? (int)(SHRINK_THRESHOLD * arrayLength) : 0;<a name="line.363"></a>
<span class="sourceLineNo">364</span>        this.upperSizeLimit = this.log2len &lt; MAX_LOG2_LENGTH ? (int)(EXPAND_THRESHOLD * arrayLength) : arrayLength;<a name="line.364"></a>
<span class="sourceLineNo">365</span>        this.numHashShifts = (64 + (this.log2len - 1)) / this.log2len;<a name="line.365"></a>
<span class="sourceLineNo">366</span>        this.numHashShifts = Math.min(12, this.numHashShifts);<a name="line.366"></a>
<span class="sourceLineNo">367</span>        this.keys = new long[arrayLength];<a name="line.367"></a>
<span class="sourceLineNo">368</span>        if (withValues)<a name="line.368"></a>
<span class="sourceLineNo">369</span>            this.values = (V[])new Object[arrayLength];<a name="line.369"></a>
<span class="sourceLineNo">370</span>    }<a name="line.370"></a>
<span class="sourceLineNo">371</span><a name="line.371"></a>
<span class="sourceLineNo">372</span>// EntrySet<a name="line.372"></a>
<span class="sourceLineNo">373</span><a name="line.373"></a>
<span class="sourceLineNo">374</span>    class EntrySet extends AbstractSet&lt;Map.Entry&lt;ObjId, V&gt;&gt; {<a name="line.374"></a>
<span class="sourceLineNo">375</span><a name="line.375"></a>
<span class="sourceLineNo">376</span>        @Override<a name="line.376"></a>
<span class="sourceLineNo">377</span>        public Iterator&lt;Map.Entry&lt;ObjId, V&gt;&gt; iterator() {<a name="line.377"></a>
<span class="sourceLineNo">378</span>            return new EntrySetIterator();<a name="line.378"></a>
<span class="sourceLineNo">379</span>        }<a name="line.379"></a>
<span class="sourceLineNo">380</span><a name="line.380"></a>
<span class="sourceLineNo">381</span>        @Override<a name="line.381"></a>
<span class="sourceLineNo">382</span>        public int size() {<a name="line.382"></a>
<span class="sourceLineNo">383</span>            return ObjIdMap.this.size;<a name="line.383"></a>
<span class="sourceLineNo">384</span>        }<a name="line.384"></a>
<span class="sourceLineNo">385</span><a name="line.385"></a>
<span class="sourceLineNo">386</span>        @Override<a name="line.386"></a>
<span class="sourceLineNo">387</span>        public boolean contains(Object obj) {<a name="line.387"></a>
<span class="sourceLineNo">388</span>            if (!(obj instanceof Map.Entry))<a name="line.388"></a>
<span class="sourceLineNo">389</span>                return false;<a name="line.389"></a>
<span class="sourceLineNo">390</span>            final Map.Entry&lt;?, ?&gt; entry = (Map.Entry&lt;?, ?&gt;)obj;<a name="line.390"></a>
<span class="sourceLineNo">391</span>            final Object key = entry.getKey();<a name="line.391"></a>
<span class="sourceLineNo">392</span>            final V actualValue = ObjIdMap.this.get(key);<a name="line.392"></a>
<span class="sourceLineNo">393</span>            if (actualValue == null &amp;&amp; !ObjIdMap.this.containsKey(key))<a name="line.393"></a>
<span class="sourceLineNo">394</span>                return false;<a name="line.394"></a>
<span class="sourceLineNo">395</span>            return entry.equals(new AbstractMap.SimpleEntry&lt;ObjId, V&gt;((ObjId)key, actualValue));<a name="line.395"></a>
<span class="sourceLineNo">396</span>        }<a name="line.396"></a>
<span class="sourceLineNo">397</span><a name="line.397"></a>
<span class="sourceLineNo">398</span>        @Override<a name="line.398"></a>
<span class="sourceLineNo">399</span>        public boolean remove(Object obj) {<a name="line.399"></a>
<span class="sourceLineNo">400</span>            if (!(obj instanceof Map.Entry))<a name="line.400"></a>
<span class="sourceLineNo">401</span>                return false;<a name="line.401"></a>
<span class="sourceLineNo">402</span>            final Map.Entry&lt;?, ?&gt; entry = (Map.Entry&lt;?, ?&gt;)obj;<a name="line.402"></a>
<span class="sourceLineNo">403</span>            final Object key = entry.getKey();<a name="line.403"></a>
<span class="sourceLineNo">404</span>            final V actualValue = ObjIdMap.this.get(key);<a name="line.404"></a>
<span class="sourceLineNo">405</span>            if (actualValue == null &amp;&amp; !ObjIdMap.this.containsKey(key))<a name="line.405"></a>
<span class="sourceLineNo">406</span>                return false;<a name="line.406"></a>
<span class="sourceLineNo">407</span>            if (actualValue != null ? actualValue.equals(entry.getValue()) : entry.getValue() == null) {<a name="line.407"></a>
<span class="sourceLineNo">408</span>                ObjIdMap.this.remove(key);<a name="line.408"></a>
<span class="sourceLineNo">409</span>                return true;<a name="line.409"></a>
<span class="sourceLineNo">410</span>            }<a name="line.410"></a>
<span class="sourceLineNo">411</span>            return false;<a name="line.411"></a>
<span class="sourceLineNo">412</span>        }<a name="line.412"></a>
<span class="sourceLineNo">413</span><a name="line.413"></a>
<span class="sourceLineNo">414</span>        @Override<a name="line.414"></a>
<span class="sourceLineNo">415</span>        public void clear() {<a name="line.415"></a>
<span class="sourceLineNo">416</span>            ObjIdMap.this.clear();<a name="line.416"></a>
<span class="sourceLineNo">417</span>        }<a name="line.417"></a>
<span class="sourceLineNo">418</span><a name="line.418"></a>
<span class="sourceLineNo">419</span>        // This works because ObjId.hashCode() == ObjId.asLong().hashCode()<a name="line.419"></a>
<span class="sourceLineNo">420</span>        @Override<a name="line.420"></a>
<span class="sourceLineNo">421</span>        public int hashCode() {<a name="line.421"></a>
<span class="sourceLineNo">422</span>            final long[] keyArray = ObjIdMap.this.keys;<a name="line.422"></a>
<span class="sourceLineNo">423</span>            final V[] valueArray = ObjIdMap.this.values;<a name="line.423"></a>
<span class="sourceLineNo">424</span>            int hash = 0;<a name="line.424"></a>
<span class="sourceLineNo">425</span>            for (int i = 0; i &lt; keyArray.length; i++) {<a name="line.425"></a>
<span class="sourceLineNo">426</span>                final long key = keyArray[i];<a name="line.426"></a>
<span class="sourceLineNo">427</span>                if (key != 0) {<a name="line.427"></a>
<span class="sourceLineNo">428</span>                    int entryHash = (int)(key &gt;&gt;&gt; 32) ^ (int)key;<a name="line.428"></a>
<span class="sourceLineNo">429</span>                    if (valueArray != null) {<a name="line.429"></a>
<span class="sourceLineNo">430</span>                        final V value = valueArray[i];<a name="line.430"></a>
<span class="sourceLineNo">431</span>                        if (value != null)<a name="line.431"></a>
<span class="sourceLineNo">432</span>                            entryHash ^= value.hashCode();<a name="line.432"></a>
<span class="sourceLineNo">433</span>                    }<a name="line.433"></a>
<span class="sourceLineNo">434</span>                    hash += entryHash;<a name="line.434"></a>
<span class="sourceLineNo">435</span>                }<a name="line.435"></a>
<span class="sourceLineNo">436</span>            }<a name="line.436"></a>
<span class="sourceLineNo">437</span>            return hash;<a name="line.437"></a>
<span class="sourceLineNo">438</span>        }<a name="line.438"></a>
<span class="sourceLineNo">439</span>    }<a name="line.439"></a>
<span class="sourceLineNo">440</span><a name="line.440"></a>
<span class="sourceLineNo">441</span>// EntrySetIterator<a name="line.441"></a>
<span class="sourceLineNo">442</span><a name="line.442"></a>
<span class="sourceLineNo">443</span>    class EntrySetIterator implements Iterator&lt;Map.Entry&lt;ObjId, V&gt;&gt; {<a name="line.443"></a>
<span class="sourceLineNo">444</span><a name="line.444"></a>
<span class="sourceLineNo">445</span>        private int modcount = ObjIdMap.this.modcount;<a name="line.445"></a>
<span class="sourceLineNo">446</span>        private int removeSlot = -1;<a name="line.446"></a>
<span class="sourceLineNo">447</span>        private int nextSlot;<a name="line.447"></a>
<span class="sourceLineNo">448</span><a name="line.448"></a>
<span class="sourceLineNo">449</span>        @Override<a name="line.449"></a>
<span class="sourceLineNo">450</span>        public boolean hasNext() {<a name="line.450"></a>
<span class="sourceLineNo">451</span>            return this.findNext(false) != -1;<a name="line.451"></a>
<span class="sourceLineNo">452</span>        }<a name="line.452"></a>
<span class="sourceLineNo">453</span><a name="line.453"></a>
<span class="sourceLineNo">454</span>        @Override<a name="line.454"></a>
<span class="sourceLineNo">455</span>        public Entry next() {<a name="line.455"></a>
<span class="sourceLineNo">456</span>            final int slot = this.findNext(true);<a name="line.456"></a>
<span class="sourceLineNo">457</span>            if (slot == -1)<a name="line.457"></a>
<span class="sourceLineNo">458</span>                throw new NoSuchElementException();<a name="line.458"></a>
<span class="sourceLineNo">459</span>            final long key = ObjIdMap.this.keys[slot];<a name="line.459"></a>
<span class="sourceLineNo">460</span>            assert key != 0;<a name="line.460"></a>
<span class="sourceLineNo">461</span>            this.removeSlot = slot;<a name="line.461"></a>
<span class="sourceLineNo">462</span>            return new Entry(slot);<a name="line.462"></a>
<span class="sourceLineNo">463</span>        }<a name="line.463"></a>
<span class="sourceLineNo">464</span><a name="line.464"></a>
<span class="sourceLineNo">465</span>        @Override<a name="line.465"></a>
<span class="sourceLineNo">466</span>        public void remove() {<a name="line.466"></a>
<span class="sourceLineNo">467</span>            if (this.removeSlot == -1)<a name="line.467"></a>
<span class="sourceLineNo">468</span>                throw new IllegalStateException();<a name="line.468"></a>
<span class="sourceLineNo">469</span>            if (this.modcount != ObjIdMap.this.modcount)<a name="line.469"></a>
<span class="sourceLineNo">470</span>                throw new ConcurrentModificationException();<a name="line.470"></a>
<span class="sourceLineNo">471</span>            ObjIdMap.this.exsert(this.removeSlot);<a name="line.471"></a>
<span class="sourceLineNo">472</span>            this.removeSlot = -1;<a name="line.472"></a>
<span class="sourceLineNo">473</span>            this.modcount++;                            // keep synchronized with ObjIdMap.this.modcount<a name="line.473"></a>
<span class="sourceLineNo">474</span>        }<a name="line.474"></a>
<span class="sourceLineNo">475</span><a name="line.475"></a>
<span class="sourceLineNo">476</span>        private int findNext(boolean advance) {<a name="line.476"></a>
<span class="sourceLineNo">477</span>            if (this.modcount != ObjIdMap.this.modcount)<a name="line.477"></a>
<span class="sourceLineNo">478</span>                throw new ConcurrentModificationException();<a name="line.478"></a>
<span class="sourceLineNo">479</span>            for (int slot = this.nextSlot; slot &lt; ObjIdMap.this.keys.length; slot++) {<a name="line.479"></a>
<span class="sourceLineNo">480</span>                if (ObjIdMap.this.keys[slot] == 0)<a name="line.480"></a>
<span class="sourceLineNo">481</span>                    continue;<a name="line.481"></a>
<span class="sourceLineNo">482</span>                this.nextSlot = advance ? slot + 1 : slot;<a name="line.482"></a>
<span class="sourceLineNo">483</span>                return slot;<a name="line.483"></a>
<span class="sourceLineNo">484</span>            }<a name="line.484"></a>
<span class="sourceLineNo">485</span>            return -1;<a name="line.485"></a>
<span class="sourceLineNo">486</span>        }<a name="line.486"></a>
<span class="sourceLineNo">487</span>    }<a name="line.487"></a>
<span class="sourceLineNo">488</span><a name="line.488"></a>
<span class="sourceLineNo">489</span>// Entry<a name="line.489"></a>
<span class="sourceLineNo">490</span><a name="line.490"></a>
<span class="sourceLineNo">491</span>    @SuppressWarnings("serial")<a name="line.491"></a>
<span class="sourceLineNo">492</span>    class Entry extends AbstractMap.SimpleEntry&lt;ObjId, V&gt; {<a name="line.492"></a>
<span class="sourceLineNo">493</span><a name="line.493"></a>
<span class="sourceLineNo">494</span>        private final int modcount = ObjIdMap.this.modcount;<a name="line.494"></a>
<span class="sourceLineNo">495</span>        private final int slot;<a name="line.495"></a>
<span class="sourceLineNo">496</span><a name="line.496"></a>
<span class="sourceLineNo">497</span>        public Entry(int slot) {<a name="line.497"></a>
<span class="sourceLineNo">498</span>            super(new ObjId(ObjIdMap.this.keys[slot]), ObjIdMap.this.values != null ? ObjIdMap.this.values[slot] : null);<a name="line.498"></a>
<span class="sourceLineNo">499</span>            this.slot = slot;<a name="line.499"></a>
<span class="sourceLineNo">500</span>        }<a name="line.500"></a>
<span class="sourceLineNo">501</span><a name="line.501"></a>
<span class="sourceLineNo">502</span>        @Override<a name="line.502"></a>
<span class="sourceLineNo">503</span>        public V setValue(V value) {<a name="line.503"></a>
<span class="sourceLineNo">504</span>            if (ObjIdMap.this.modcount != this.modcount)<a name="line.504"></a>
<span class="sourceLineNo">505</span>                throw new ConcurrentModificationException();<a name="line.505"></a>
<span class="sourceLineNo">506</span>            if (ObjIdMap.this.values != null)<a name="line.506"></a>
<span class="sourceLineNo">507</span>                ObjIdMap.this.values[this.slot] = value;<a name="line.507"></a>
<span class="sourceLineNo">508</span>            return super.setValue(value);<a name="line.508"></a>
<span class="sourceLineNo">509</span>        }<a name="line.509"></a>
<span class="sourceLineNo">510</span>    }<a name="line.510"></a>
<span class="sourceLineNo">511</span>}<a name="line.511"></a>
<span class="sourceLineNo">512</span><a name="line.512"></a>




























































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